清越鉱山の坑内湧水について

抄録

The geology of this mine is compossed of Tertiary Green tuff, Tuff breccia, propylite and Dolerite being covered by Quarternary volcanic pyroclastic formations. The ore deposits are fissure filling Au-Ag bearing quartz vein in the Miocene formation called Yugashima series.
The volume of the underground water is 40m³/min, drained spontaneously from the lowest gallery, 30m level, of the mine and the volume above mentioned is almost constant through the year having no direct relation to the clinrate and seasons.
The water comes out mainly from north and south end of the lowest gallery. The origine of the water is pressumed fissure filling water supplied from the Quarternary pyroclastics which cover the Tertiary formations.
As its characteristics, the water indicates weak alkali, has the Electrical specific resistance high at south and low at north side of the gallery, and amount of the solvent oxygen is very few.